Centrifugal pump or blower.



' c. 0'. HARDER.

GENTRIFUGAL PUMP 0R BLOWER.

APPLIOATION FILED OO I1 8, 1908.

Patented July 27, 1909.

UNITED STATES PATENT onnica.

CARL CAESAR HARDER, OF HAMBURG-HAMM, GERMANY, ASSIGNOR TO BERNHARD BOMBORN, OF BERLIN, GERMANY.

GENTRIFUGA-L PUMP OR BLOWER.

Specification of Letters Patent.

Patented m 27, 1909.

To all whom it may concern:

Be it known that I, CARL CAESAR HARDER, merchant, a citizen of the town of Hamburg- Hamrn, residing at 155 Ritterstrasse, Hamburg-Hamm, in the Empire of Germany, have invented certain new and useful Improvements in Centrifugal Pumps or-Blowers, of which the 'following is a specification.

This invention relates to centrifugal umps and blowers and more particularly re 'ers to that class of pump or blower in which the liquid or the gas or air has an axial entry and tangential exit, but the invention can be aplied equally well to centrifugal pumps and lowers with entries and exits in other positions.

Hitherto in usual'to em loy blades fixed to a crown usually single, ut this form of construction PIG: sented disadvanta es both in strength and firmness and the ulk of the blades considerably reduced the capacity of the pump or blower and considerable friction arose through the whirlings or eddies which occurred around the periphery of the impeller and thus the efficiency of the pump or blower was considerably reduced. 1

The present invention particularly consists in'an improved impeller, the main feature of which is that instead of em loying blades, the same is constructed in orm of a tube composed of individual corrugated rings and arranged in axial direction side by side, in such a manner that the recesses or projections formed by the corrugations of the adjoining rings are either adverse or dis laced relative to one another, owing to w ich a net-like formation results.

According to the breadth of the pumps or blowers desired the impellers may be composed of any number of rings which mayeither directly bear against one another or be separated by other rings inserted between them in the manner hereinafter specified. For driving heavy 1i uids or for other purposes the rings ma e made of cast metal, while for gas and an they may preferably be stamped or pressed out of sheet metal.

To make my invention more clear the same is illustrated in the accompanying drawing, in which similar reference letters denote corresponding parts and in which On the accompanying drawings Figure 1 this class of device it has been 7 shows the exterior view of a centrifugalblower or a centrifugal-pump. Fig. 2 is a section on A-B of Fig. 1, the net like structure or grain being only partially shown. Figs. 3 and 4;, 5 and 6 show the lateral views and top-views of one of the rings of which the impeller consists. Fig. 7 is a section through a. conically constructed impeller, the netlike structure not being shown for the sake of simplicity. Fig. 8 is a sectional view on the line C-D of. Fig. 1 with a full top view of the impeller. Figs. 9 and 10 show the disks contacting against each other, somewhat enlarged and in various shapes. In Figs. 11 and 12 intermediate rings are also arranged between the disks. I

With reference to the drawing P denotes the casing of the pum or blower, in which the medium is adapter to enter axially and to leave in radial or tangential manner. The impeller consists of a bearing part 1 which is adapted to fit on. the drivingshaft (not shown). Suitably secured to the bearing part1 are rings or cut sheet metal and may be either of curved, (Figs. 3, 4, 5, 6, 8, 9, 1 1) angular or rectangular (Figs. 10, 12),or any other shape.

. In Fig. 3 the corrugations or net work are shown of curved shape, while in Fi 5 they are straight-but under different ang es to the center. 1

For the attachment of the supply pi e (not shown) and for closing the pump or lower at that side a ring 6 may be emp oyed which may be secured in position byax'ially ektending bolts 7 engaging the bearing art 1, or in any other convenient manner. y the tightening of the bolts the individual rings are pressed against one another and form a rigid body.

To revent the rings from becoming accidenta y displaced relative to one another the projecting parts or tops of the corrugations of the rm s may be alternately formed with cavities 8 Fig. 10), or rojections 8and cavities 8 (Fig. 9), where y the adjacent rings will be engaged with one another (Figs. 9 and 10).

The impeller is suitable for receiving the medium from either side. Its longitudinal sectional shape may vary, as for instance, in Fig. 7 the rings are shown as being of con- 2 which may be either cast or made of stamped cone shape.

rings 2. be 15 tions extend para el to one another, and the tops thereof do not meet as in the former modificationsi- In such cases intermediate rings 9 arearranged; between the adjacent The intermediate rings may also rovided with cavities 8 similar to the cavities 8 in Figs. 9 and 10, and the projecting arts-or tops of the corrugations may be ma e to e age said recesses, to prevent relative dis acement of the rings.

The chie advantage of \my invention consists in thatthe construction of pumps orbloweis is extremely simple and the breadth of the latter may be varied according to re;

quirements by increasing or decreasing thenumber of individual rings.-

1 Another advantage of 'my. invention is that the parts of the impeller wheel are not:

J corrugations ser corrugations serving as apt to be thrown outyby a centrifugal force because of their annular shape,

What I claim and desire toseeure by Letters Patentis: j

1; In centrifugal pu :and blowers,an impeller composed ,of in 'vidual neorrugated rings and. arranged axially side by. side, the I V as blades, and means for joining the individual-"rings to a rigid body and preventing their'relativedisplacement. a 7' 2. In centrifugal pum s and blowers, an impeller composed of; in ividual corrugated rmgs'and arranged axiallly side by side, the b ades, intermediate rings arranged between the corrugated rings, means for oining the individua impeller composed o ri 'd bod and means for preventing the re ative displacement of the individual rings.

ative displacement of the individual rings. I

'- 4. In centrifugal pumps or blowers, an individual corrugated s and arranged axially side by side, and

rm wit 'their corrugations adverse to one another, said corrugations serving as blades,

intermediate rings arranged between said corru ated rings, means for joining the individua rings to a rigid body, and means for preventing the relative displacement of the individual rings.

' 5. In centrifugal pum s or blowers, van impeller composed of in ividual corrugated rings and arranged axially side by side, the corrugations serving as blades and alternately formed 'at their tops with cavities to allow of the engagement of the adjoining rings with one another, and means forjoin- 'ing the individual rings with one another.

6. In centrifugal pum s and blowers, an

impeller composed of in ividual corrugated rings and arranged axiall side by side, the corrugations serving as b ades, intermediate rings arran ed between-said corrugated rings a forme with cavities to engage the tops of the corrugations and a means for joining the individual rin s with one-another.

" In testimony w ereof I afiix my signature 0- in presence of two witnesses.

CARL CAESAR HARDER.

' Witnesses:

ERNEST HxL. MUMMENHOFF, Orro W. 'HELLMRIOH. 

